Fast, correct JSON library for Python

https://pypi.org/project/orjson/ https://github.com/ijl/orjson/

Capture the outcome of Python function calls

https://pypi.org/project/outcome/

Core utilities for Python packages

https://pypi.org/project/packaging/

Divides large result sets into pages for easier browsing

https://github.com/Pylons/paginate

MQTT version 3.1/3.1.1 client class

https://www.eclipse.org/paho/

Flexible, high-performance data analysis in Python

https://pandas.pydata.org/

Parameterized testing with any Python test framework

https://github.com/wolever/parameterized

Python SSH2 protocol library

https://www.paramiko.org/

HTTP and FTP parallel file downloader

https://github.com/Cadair/parfive

Python module for parsing 'human readable' date/time expressions

https://github.com/bear/parsedatetime

Python Parser

https://github.com/davidhalter/parso

Comprehensive password hashing framework supporting over 30 schemes

https://bitbucket.org/ecollins/passlib

Library to parse and apply unified diffs

https://github.com/conan-io/python-patch-ng

Module wrapper for os.path

https://github.com/jaraco/path.py

Object-oriented paths

https://github.com/p1c2u/pathable

Object-oriented filesystem paths

https://pypi.org/project/pathlib2/

Utility library for pattern matching of file paths

https://pypi.org/project/pathspec/

Python Build Reasonableness

https://github.com/openstack-dev/pbr

Pure-Python PDF toolkit

https://mstamy2.github.io/PyPDF2/

Build backend used by PDM that supports latest packaging standards

https://backend.pdm-project.org/ https://github.com/pdm-project/pdm-backend

WSGI object-dispatching web framework

https://github.com/pecan/pecan/

Python package to ease datetimes manipulation

https://pendulum.eustace.io

Check PEP-8 naming conventions, plugin for flake8

https://pypi.org/project/pep8-naming/

Pure Python Expect-like module

https://pexpect.readthedocs.io/

Pure-Python Interface to the PostgreSQL Database

https://github.com/tlocke/pg8000

Factory+Registry pattern for Python classes

https://github.com/todofixthis/class-registry/

Pidfile management for Python

https://pypi.org/project/pid/

Fork of the Python Imaging Library (PIL)

https://python-pillow.org/

Tool for installing and managing Python packages

https://pip.pypa.io/en/latest/

Importable pip API

https://github.com/di/pip-api

Interface Python with pkg-config

https://pypi.org/project/pkgconfig/

Query metadatdata from sdists / bdists / installed packages

https://pypi.org/project/pkginfo/

Python module for determining appropriate platform-specific dirs

https://github.com/platformdirs/platformdirs

Plugin and hook calling mechanisms for Python

https://github.com/pytest-dev/pluggy

Plugin and hook calling mechanisms for Python

https://github.com/pytest-dev/pluggy

Support library for building plugins sytems in Python

https://github.com/mitsuhiko/pluginbase

Python Lex-Yacc

http://www.dabeaz.com/ply/

Python PNG encoder/decoder

https://github.com/drj11/pypng

Collection of helpful Python tools

https://pypi.org/project/pockets/

Poetry PEP 517 Build Backend

https://github.com/python-poetry/poetry-core

Python library to parse and manage gettext catalogs

https://bitbucket.org/izi/polib/

Band-oriented PDF report generation from database query

http://newcenturycomputers.net/projects/pollyreports.html

Fetch your sample data files

https://github.com/fatiando/pooch

Monitors TCP ports for bound or unbound states

https://github.com/jaraco/portend

TLS client policy for Postfix according to domain MTA-STS policy

https://pypi.python.org/pypi/postfix-mta-sts-resolver

Python 3 compatible PostgreSQL database driver and tools

http://python.projects.postgresql.org/

Pure Python Off-The-Record encryption

https://github.com/afflux/pure-python-otr/

Lightweight YAML Parser

https://pypi.org/project/poyo/

Resolving Swagger/OpenAPI 2.0 and 3.0.0 parser

https://github.com/RonnyPfannschmidt/prance

Framework for managing and maintaining multi-language pre-commit hooks

https://pre-commit.com/